PERMFILE134266

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 70 REFUSE PILE EXPANSION
• Media Type: D
• Archive: No

TABLE 3. REFUSE PILE EXPANSION LIFE
Phase Capacity (cy) Capacity (tons) Cummulative Capacity (tons) Phase Life Cummulative Life (yrs)
]A 0 0 0
1 B 27,515 27,515 27,515 .Apr -May '97 0.1
1 C 32,167 32, 167 59,682 May -tun `97 0.2
1D 60,138 60,138 119,820 Jun-Jul `97 0.3
2 70,738 70,738 190,558 Jul -Aug '97 0.4
3 930,422 930,422 1,120,980 7.0 7.4
4 263,102 263,102 1,384,082 2.0 9.4
Assumed unit weight for refuse material: 74 pcf.
Based on annual refuse production presented in Table 2.
TABLE 4. RPE LEACHATE PRODUCTION
Construction Phase Annual Average Leachate Production (cy) Peak Leachate Production
(cf/day)
2 119,465 3,851
3 49.191 770
4 28,109 578
~~

TABLE 5. SUMMARY OF STRENGTH PARAMETER DATA FOR RPE SLOPE
STABILITY ANALYSIS
MATERIAL DESCRIPTION WET UNIT
WEIGHT
(PCF) DRY UNIT
WEIGHT
(PCF) COHESION
(PSF) FRICTION
ANGLE
(DEGREES) COMMENTS
GRAVEL SOILS 115.0 110.0 250.0 29.0 1
CLAY SOILS 118.0 100.0 193.0 21.6 2
BEDROCK 150.0 150.0 200,000.0 40.0 3
COAL WASTE 6R.0 58.0 800.0 39.0 4
COMPACTED CLAY LPJER 125 118 2.000 0
HDPE GEOSYNTHETIC LMER 2 2 1,000 18 5
PVC GEOSYNTHETIC LINER 2 2 1.000 25 ~
Engineerine Fills 118.0 100.0 2000.0 0.0 2
I. Gravel soil strength values developed from triaxial shear testing conducted by Garco Testing Laboratories, 1995.
2. Clay soil strength values developed from previous soil testing of the materials storage bench at WEM. All triaxial shear
strength testing conducted by the Colorado Slate University Soil Testing Lab.
3. Sandstone bedrock strength values taken from E. Hoek, 1. W. Bray. 1973. "Rock Slope Engineering". Revised Third
Edition. Institution of Mining and Metallurgy, pp ?3.
4. Coal waste strength values developed from sample taken from the existing coal waste pile adjacent to proposed RPE.
All triaxial shear strength testing conducted by Garco Testine Laboratories, 1995.
5. Layfield Plastics, Inc., Bellingham, WA, Conservative tensile strength used to represent cohesion in model.